<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin:0;
      padding:0;
    }
    .box-phone {
      width: 500px;
      height: 600px;
      margin:100px auto;
      border: 1px solid red;
      position: relative;
      
      /* 1 */
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .box-phone img {
      /* position: absolute; */

      /* 2 */
      /* left: 50%;
      top: 50%;
      transform: translate(-50%,-50%); */

      /* 3 */
      /* top:0;
      left: 0;
      right: 0;
      bottom: 0;
      margin: auto; */

      

    }
  
  </style>
</head>
<body>
  <div class="box-phone">
    <img src="../images/pserson.png" alt="">
  </div>
</body>
</html>